The talk discusses the concept of sandboxing in Linux and the introduction of the Rust library called Landlock to provide built-in application security. The library is based on the builder pattern and provides tailored security policies that can be embedded in an application. The talk covers the importance of security, compatibility requirements, and the various approaches taken to improve the library's configuration options. The talk concludes with a discussion on the future improvements to the Landlock library and encourages developers to use and contribute to it.